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參數(shù)資料
| 型號： | LTC4085EDE-3#TRPBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 電源管理 |
| 英文描述： | POWER SUPPLY MANAGEMENT CKT, PDSO14 |
| 封裝： | 4 X 3 MM, PLASTIC, MO-229, DFN-14 |
| 文件頁數(shù)： | 6/24頁 |
| 文件大?。?/td> | 275K |
| 代理商： | LTC4085EDE-3#TRPBF |
LTC4085-3
14
40853f
USB Current Limit and Charge Current Control
The current limit and charger control circuits of the
LTC4085-3 are designed to limit input current as well as
control battery charge current as a function of IOUT. The
programmed current limit, ICL, is dened as:
ICL =
1000
RCLPROG
VCLPROG
=
1000V
RCLPROG
The programmed battery charge current, ICHG,isdenedas:
ICHG =
50,000
RPROG
VPROG
=
50,000V
RPROG
Input current, IIN, is equal to the sum of the BAT pin output
current and the OUT pin output current:
IIN = IOUT + IBAT
The current limiting circuitry in the LTC4085-3 can and
should be congured to limit current to 500mA for USB
applications (selectable using the HPWR pin and pro-
grammed using the CLPROG pin).
The LTC4085-3 reduces battery charge current such that
the sum of the battery charge current and the load current
does not exceed the programmed input current limit (one-
fth of the programmed input current limit when HPWR
is low, see Figure 2). The battery charge current goes to
zero when load current exceeds the programmed input
current limit (one-fth of the limit when HPWR is low). If
the load current is greater than the current limit, the output
voltage will drop to just under the battery voltage where
the ideal diode circuit will take over and the excess load
current will be drawn from the battery.
ILOAD (mA)
0
CURRENT
(mA) 300
400
600
500
IIN
400
40853 F02a
200
100
–100
0
100
200
300
600
500
ILOAD
IBAT
CHARGING
IBAT
(IDEAL DIODE)
ILOAD (mA)
0
CURRENT
(mA)
60
80
120
100
IIN
80
40853 F02b
40
20
–20
0
20
40
60
120
100
ILOAD
IBAT
CHARGING
IBAT
(IDEAL DIODE)
ILOAD (mA)
0
CURRENT
(mA) 300
400
600
500
IIN
400
40853 F02c
200
100
–100
0
100
200
300
600
500
ILOAD
IBAT
CHARGING
IBAT
(IDEAL DIODE)
IBAT = ICHG
IBAT = ICL – IOUT
(2a) High Power Mode/Full Charge
RPROG = 100k and RCLPROG = 2k
(2b) Low Power Mode/Full Charge
RPROG = 100k and RCLPROG = 2k
(2c) High Power Mode with
ICL = 500mA and ICHG = 250mA
RPROG = 100k and RCLPROG = 2k
Figure 2: Input and Battery Currents as a Function of Load Current
OPERATION
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC4085EDE-4#PBF | 功能描述:IC USB POWER MANAGER 14DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:* 標(biāo)準(zhǔn)包裝:61 系列:- 功能:電源管理 電池化學(xué):鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:4.35 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:22-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:22-DFN（6x3）裸露焊盤 包裝:管件 |
| LTC4085EDE-4#TRPBF | 功能描述:IC USB POWER MANAGER 14DFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電池管理 系列:* 標(biāo)準(zhǔn)包裝:61 系列:- 功能:電源管理 電池化學(xué):鋰離子（Li-Ion）、鋰聚合物（Li-Pol） 電源電壓:4.35 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:22-WFDFN 裸露焊盤 供應(yīng)商設(shè)備封裝:22-DFN（6x3）裸露焊盤 包裝:管件 |
| LTC4085EDEPBF | 制造商:Linear Technology 功能描述:Li-Ion Charger + USB Power Mgr LTC4085 |
| LTC4085EDE-PBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:USB Power Manager with Ideal Diode Controller and Li-Ion Charger |
| LTC4085EDE-TRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:USB Power Manager with Ideal Diode Controller and Li-Ion Charger |
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